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CPS. BURTON VACUUI FUEL FEDING DEVICE' FOR INTERNAL COIBUS'TIHSBNGINES A'ND THE LIKE origina; Filed laren 22. 1922 N1 bm@ N, fnx. uumwn., .u

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Reissued Nov. A24, 1925.

UNITED STATES PATENT OFFICE.

CHARLES S. BURTON, OF OAK PARK, ILLINOIS, ASSIGNOR TO STEWART-WARNER SIEEDOMETER CORPORATION, OF CHICAGO, ILLINOIS, A CORPORATION OF VIR- GINIA.

VACUUM FUEL-FEEDING DEVICE FOR INTERNALCOMBUSTION ENGINES AND THE LIKE.

Original No. 1,439,689, y(lated December 26, 1922, Serial No. 545,658, iiled March 22, 1922. Application for reissue filed February 26, 1925.

1'0 all whom it may concern.'

Be it known that I, CHARLES S. BuRToN,

a citizen of the United States, residing at Oak Park, in the county of Cook and State of Illinois,` have invented new and useful Improvements in Vacuum Fuel-Feeding Devices for Internal-Combustion Engines and the like, of which the following is a specification, vreference being had to the accompanying drawings, forming a part thereof. y

The purpose of this invention is to provide au improved construction in a vacuum fuel feed device .for hastening the liquid delivery from 'the receiving to the delivery chamber, and for other purposes incident thereto. `It consists in the elements and features of construction show and described, as indicated in the claims.

In the drawings Figure 1 isa vertical section at the line, 1 1, on Figure 2.

Figure 2 is a vertical section at the line, 2-2, on Figure 1.

Figure 3 is a detail sect-ion at the line, 3-3, on Figure 1. In the drawings there is shown a vacuum tank having a receiving chamber, A, and a delivery chamber, B, separated by a diaphragm, a, through which the liquid fuel is delivered from the chamber, A, into chamber, B, past a check valve, C, of familiar form and operation. The receiving chamber is closed at the top by a cap plate X, in and through which the vvarious connections of the tank for liquid supply, suction and atmosphere vent, and the like are made, as hereinafter described. The delivery chamber is finished at the bottom by an outflow fitting comprising two members, s and s1, mounted in a! closure plate, T. Said closure plate being employed for the purpose of permitting an adequately sized opening in the bottom of the tank for convenience in makr ing the necessary connections of the fitting,

S, as hereinafter particularly described.

The suction connection is indicated by the fitting, H, and the suction port, h, is con trolled by a valve, H1, operatively connected with the float, J, for seating said valve, H1, bv the rise of the float to a predetermined high liquid level indicated by the dotted Serial No. 11,892.

line, j, Preferably, the float has a range of `movement on the stem, J1, of the suction valve, between the upper and lower stops, jl, j, respectively, so that upon the liquid level falling a certain distance, the float becomes lodged on the lower stop, and upon the level further falling, diminishing the submergence of the float, the effective or unbuoyed weight of the float ultimately becomes suffi` cient to break the suction hold upon the valve, H1, whereupon the float descends with the valve stem to the lowest position shown in full line in Figures 1 and 2.

The liquid supply connection is indicated by the fitting, M, which connects the pipe, m, leading from the low source of supply not shown with the fuel inlet duct, m1, formed in the cap plate, X. The atmosphere inlet duct is shown at n opening into the fuel inlet duct, m1, a little back of the discharge mouth of said duct into the chamber, A. The junction of the air inlet. duct and the fuel inlet passage is lined with a fine woven wire screen or strainer thimble or sleeve, fn?, which serves 'two purposes, first, to restrict the air inlet, and second, to prevent the entrance of dust either with the air or the fuel. This woven wire screen or strainer masks the port of communication of the air inlet with the liquid fuel inlet at the aperture, n4, and stands'directly in the path of the in-coming liquid, so that when'the inflow of liquid is occurring, the entrance of air is very largelj,7 prevented or reduced.

The suction duct, h, is T-shaped, the suc tion port, h1, at which the valve, H1, seats being at one end of the cross of the T. The other end of this cross passage opens into va small valve chamber, h4, from which a. duct, h5, leads down through the cap and is connected by a' tube, h, which extends through the chamber, A, and the diaphragm, a, to the lower chamber, B. A valve, H2. similar to the valve, H1, and connected with the latter by a slender stem, H3, which eX- tends through the cross member of the T- shaped passage mentioned, seats at the opposite end of said cross passage from that at which the valve, H, is seated. From this construction it will be seen that the movement of the suction-controlling valve., H1,

for seating at the port, z, unseats the valve,

H2, from its seat at the otherend of the cross passage, and vice versa, that lthe unseatng of the valve, H1, seats the valve, H2. The purpose and operation of the device iirtlii's respect is, that lwhen the suction is cut off from the receiving chamber,-A, it is instantly and by the same action of the valve device, shifted onto the chamber, B. The purpose of such 'shifting is, that 'ufhereas the restriction of the atmosphere inlet to the chamber, A, (which may be caused in any manner, and which is caused bythe .fine -mesh Wire, screen or strainer, n.3, at the atmosphere inlet- ;port) is necessary in order that theair inletmaynot Vbeso freeqasgto defeat the operation of the suction for lf ng the liquid from the lower source to the chamber, ,A7, nevertheless such restriction tends to restrict the rate o f delivery of the` .liquid-by` gravity from the chamber, A, to the chamber B; and to overcome or offset lthis restrictioirthe. suction is transferred to'the chamber, B, when it is cut off fromgthe chamber, A, so that the liquid is pulled .out of the chamber, A,'by the suction; and `its flow, therefore, is not limited merely by the.gravity action. That is to say, the suction operating in the chamber, B, upon the shifting of the 'suction valves as describe-d, offsets the air restriction at the air inlet .to the chamber, A, for 'the purpose of delivery of liquid from the chaiuber, A, to the chamber, AB.

By reason ofthe transfer-'off suction to the chamber, B ,as described, for-hasteningthe delivery of liquid from the vacuum -vchainber to said chamber, B, tl are can-be no delivery by gravity from chamber, B, during the delivery of liquid .into the chamber, B, tfrom t-he vacuum chamber, A; and the/'supply to the carbureter yduring these intervals,- Whilel the chamber, B, is -lilling,is alforded by the connecting passage from the chamber, B, to thecarini-reiter, which includes the cavity ofthe deliifery fitting-from said chamber, Bfwhich for'that pu'rgiiofse'niay bomade of considerable sizeif so desfred. This de livery fit-ting consists of a. threaded nipple, S, on. the upperend of which there screwed a cap member, S1, Which'hasan interior annular recess, S4, positioned for yregistering with a. series of radial openings, in .the nipple, S. The cap, S1 has a centralaperture in its head at s1, upontheunder'side of which there is provided for seating upward thereagainst, a check valve, s?, which is in the form of a thin metal disk having'struck and folded downfronji its margin, lugs,'s20, leaving marginal notches or apertures, ,5121, for the passage of the liquid around said disk valve. The lugs, S20, constitute legs `by which the valveis stepped on thefiipper end of the nipple, S, kbeing guided by theprojections'between the marginal apertures for short up-and-do-ivn movement seating upwardly, as stated, at the'margin of the aperture, s1. Into the side ofthe cap, S1, the lower end of the tube, Q, is soldered fast, said tube being bent to terminate horizontally at its lower end for this connection. Preferably vthe nipple, S, inserted through a closure plate, T, which is: -of suliiciently greater diameter than a central aperture, b, in the bottom of the chamber, B, to belapped at the Inarginthereof for 'secureinent thereto 'as shown by screws, t1, 251, suitable packing Y,being interposed to make a tightl joint. The

purpose of `providing this aperture and closure plate is to 'facilitate the assembling of the fitting.

The tube, Q, is soldered or otherwise made tight and secure vat its point of insertion kthrough the diaphragm, a, before thatdiaphragm is introduced into the body -Inem `ber ofthe device, Which is done bypassing it doivn'through-theopen upper end of the proper =point `and vsoldering :its "flange, a3, tothe body member Which-forms the Wal-ls of the chambers, A'and B. Then thus connected, the cap member, S1 carried up- `onthe horizontally-projecting lower'end of rthe tube, Q, is positioned substantially'ceirtrally with respect to the aperture, b", and the nipple, S, being screwed into the cap a suitable distance to position the lvalve, "S1, with respect to its seat and the recess-S4, in registration With -the aperture, -Siwthe closure plate, T, is passed over the nipple fand followed by a securing nut T1, and *said closure plate is then securedy by screws, 11' to the bottom of the chamber. The protrudingend ofthe nipple, S, serves vforzconnecting any suitable fitting for attaching `a pipe, T2,to conduct I the liquid-to the carburter.

The pipe, Q, is extending upthroughithe chamber, A, and into kthe'eap, X, Where it isconnected, rnot only for atmospheric Ainlet to thefitting,-S, and thereby ato thezpipe connection with the .carbureter, but also 'for the purpose of permitting expansion of liquid vwhich may-'occur from overheating' of the device to find relief .by -Lliselrargc back'into the chamber, A, from the chainber, B, or from lthe pipe connectiom-iinc'luding the fitting', S,'off said chamber, B, Withthe earburet-er. 'For these vtwo .pur-

poses thexconnectou of said pipe,"Q, 'with the cap and the duct passages i-n thexcap, X, are as follows: ln the cap, X, y:there lis formed a valve chamber which, as "illustrated and in the preferred form, has a'flat seat, m2, through `which there are madeitw'o ports, o23 and m4. Into 'the port, rc3, .the upper'end of sthe'tubepQ, extends and may be fitted tightly,'though an absolutely .nonleakingt isv not necessary. The oth`er-port opens Vdirectlykinto the upper end of the chamber, A. In 'the Valve chamber, "f1 2, there isa thin disk valve, Y, 'which E-is :d.imensioned Vfor 'seating over and 1covering both the ports, m4 and ma. The operation of JIU Cri'

level of the upper chamber', A, it is con-A siderably short of being filled. And in any event, the upper end of the chamber, A, being in open communication through Vthe pipe, en, with the main tank which is a source of fuel supply at low level, any

amount of liquid which might be forced` over from the lower chamber, B, into the upper chamber, A, would in the last emergency be carried over into and through the pipe, m, to the main tank below. For the purpose of the atmospheric inlet through the pipe, Q, to the chamber, B, and to the delivery or discharge pipe therefrom, the cap plate, X, has an atmosphere inlet duct, .f2/f5, which opens into the port or duct, ma, below the valve chamber, X2; and this atmosphere inlet duct, has a downwardlyextending portion, ai, at the upper end of which is a small valve chamber, m7, in which there is a small ball valve, aes, seating at the upper end of said downwardlyextending portion of the duct and adapted to open for inlet of air but seating upon any pressure from within tendingr `to discharge outwardly, so that the. discharge of liquid out through this atmosphere inlet in case of eX- pansion of liquid in the chamber is rendered impossible.

For affording atmospheric inlet to j[he chamber, B, to permit delivery therefrom past the check valve, S2, toward the carbureter, a pipe, R, is provided extending down through the diaphragm, u., and up into the plate, X, where it leads into a duct,- 7", which opens laterally into a small chainber, r1, from the bottom of which a duct, r2, leads to the atmosphere. A check val-ve, t, seating at the upwardly open mouth of the duct, r2, opening upwardly for inflow of air, but being seated by any pressuretending to cause outflow from the chamber, B.

To prevent liquid being drawn up through the tube, h6, which mighthappen after the lower chamber, B, became full, a float-operated valve, h6", is provided at the entrance to said pipe, h6. A convenient form and mounting for such valve is shown, the valve being carried on a short lever arm, 71.61, pivoted on the under side of the diaphragm, a, and up into the plate, X, where it leads ,into a duct, r, which opens laterally into a small chamber, r1, from the bottom of which a duct, r2, leads to the atmosphere. A check valve, t, seating at the upwardly open mouth of the duct, r2, opening upwardly for iufiow of air, but being seated by any pressure tending to cause outfiowfi in the cham-- ber, B.

To prevent liquid being drawn up through the tube, 7L, which might happen after the lower chamber, B, bec-aine full, a float-operated valve, hm, is provided at the entrance to said pipe, 71". A convenient form and mounting for such valve is shown, the valve being carried on a short lever arm, 71,61, pivoted on the under side of the diaphragm', c, and having below the valve a :(loat, 7i, which may be a small piece of cork or the like which will float the valve to its seat before the liquid rises to the entrance of the pipe, ILS. To prevent this air inlet passage from defeating the operation of the suction vfor supplementing the gravity action for hastening delivery of liquid from chamber, A, into chamber, B, the pipe, R, may have its mouth in the chamber, B, positioned as shown `in Figure 2, opposite the valve, Z, which is swung open by the discharge of liquid from chamber, A, and the back side of said valve may be formed as seen at Z1, as a valve for closing the mouth of pipe, R, when the liquid is [lowing out of ch amber, A. This will not entirely prevent access of air through pipe, R, during suction in chamber, B, but it will so far restrict it as to leave the suction effective for the purpose of hastening the delivery of liquid from the chamber, A, into chamber, B;

I claim l. A vacuum fuel feeding device comprising a receiving chamber and delivery chamber, the receiving chamber haifing a restricted air inlet; a duct connecting the upper part of the two chambers; a suction connection from said duct; valve seats in said duct respectively on the side of said suction connection toward and on. the side thereof rom the receiving chamber; a valve device positioned for seating alternatively on one or vthe other of said seats, and means operated by change of level of the liquid in the delivery chamber' for shifting the seating of said valve device from one seat to the other.

2. The construction as defined in claim l, foregoing, having the two valve seats facing toward each other and the valve device comprising two valve` heads and an operating connection between them extending through both seats.

3. In the construction as defined in claim l, foregoing, the two valve seats being faced in opposite directions and the valve device being adapted to be shifted bodily from one seat to the other; the means for shifting the valve device being a iloat in the receiving chamber and a stem connected with the valve device and provided With means for encounter of the float in the rise and fall of the latter.

' 4. In the construction delined in claim l, foregoing, the delivery chamber having an air inlet and a liquid outlet provided Wi th a one-Way seating valve openinf` in the direction Afor outflow.

5. In the construction defined in claim l, foregoing, the delivery chamber having an air inlet and a liquid outlet provided with a one-Way seating valve opening in the direction for outflow of liquid; a conduit for the liquid leading from said outlet and an air vent from said conduit consisting oi? a duct extending upward to a point above the high liquid level of 'the receiving chamber.

6. In the construction de'ined in claim 1 foregoing, the delivery chamber having an atmosphere inlet passage and a check valve therein adapted to open for air entrance and to be held seated by pressure or flow out of lsaid delivery chamber.`

7. In the construction delined in claim l, foregoing, the deli\fery chamber having an atmosphere inlet duct and a valve for closing the same, said valve being exposed to the flow of liquid delivered from the vacuum chamber in a direction for being closed thereby.

8. In the construction deiined in claim l, foregoing, the delivery chamber having an atmosphere inlet passage, a valvel therein adapted to open for air entrance and to be held seated by pressure or flow outward fromsaid chamber, and a second valve for closing said passage positioned in the delivery chamber or exposure to the flow of liquid into said chamber from the vacuum chamber in a direction for being closed by said flow.

9. In a vacuum fuel feeding device having a vacuum chamber, a chamber into which the vacuum chamber delivers liquid past a non-return valve, and a third chamber or passageinto which the second chamber delivers liquid past a second non-return valve in combination with said chambers and valves; a duct leadingfrom t-heupper part of the third chamber back to thefirst chamber, said ductcomprising a valve chamvfer having a valve seat with ports therein leading to the third and first chambers respectively, land a valve device insaid valve chamber which seats at both of said ports by one and the same seating movement.

l0. In the construction deiined in kclaim 9., foregoing, a branch from the beforefmentioned duct leading oli therefrom between said third chamber and said valve chamber to the atmosphere, and a check valve in said branch duct opening liior atmosphere inlet and adapted to be held seated by pressure or iimv outward.

li. In the construction defined in claim 1, a float operated valve for closing the mouth in the delivery chamber of the duct nientioned which connects'the upper part ots-aid chamber, whereby said due-t meuth is closed by the rise of liquid in therdelivery eliamlier, to a predeteri'nined height.

l2. In the construction dei'ined in Claim 1, foregoino', a valve located in the delii=very chamber controlling delivery 01"' 'liquid from the receiving chamber, an atniiosphere i-nlet duct opening in the upperpart of vthe delivery chamber and means by which the opening of said valve by and iicr outflow from the receiving' to the delivery chamber closes the mouth of said air inlet duct.

In testimony whereof, Ihave hereunto set myhand at Chicago, Illinois, this 22nd lday of'January,

Gil 

